| 摘要 |
An SDH (synchronous digital hierarchy) 2-fiber ring network optical multiplexing device, which, in order to increase the amount of usable bandwidth when the network is operating normally by selectively limiting the number of protection channels when a communications fault is detected, has opto-electrical converters and electro-optical converters for the purpose of sending and receiving signals on each optical transmission path in two directions, a channel operating section which perform operations on the required channel for the transmitted and received signals, a transmitting/receiving control section which performs transmitting/receiving control of the required channel signals with respect to channel operating section, and an input/output interface section which interfaces signals received from and transmitted to the outside, wherein the transmitting/receiving control section allocates different numbers of channels so as to limit the number of protection channels with respect to the number of working channels on the optical fiber transmission path, thereby increasing the usable bandwidth when the network is operating normally.
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